H1102 datasheet(24/54 Pages) MICREL

24 / 54 page

Micrel, Inc.

KSZ8041NL/RNL

September 2010

M9999-090910-1.4

MII Signal Definition (KSZ8041NL only)

The Table 2 describes the MII signals. Refer to Clause 22 of the IEEE 802.3 Specification for detailed information.

MII

Signal Name

Direction

(with respect to PHY,

KSZ8041NL signal)

Direction

(with respect to MAC)

Description

TXC

Output

Input

Transmit Clock

(2.5MHz for 10Mbps; 25MHz for 100Mbps)

TXEN

Input

Output

Transmit Enable

TXD[3:0]

Input

Output

Transmit Data [3:0]

RXC

Output

Input

Receive Clock

(2.5MHz for 10Mbps; 25MHz for 100Mbps)

RXDV

Output

Input

Receive Data Valid

RXD[3:0]

Output

Input

Receive Data [3:0]

RXER

Output

Input, or (not required)

Receive Error

CRS

Output

Input

Carrier Sense

COL

Output

Input

Collision Detection

Table 2. MII Signal Definition

Transmit Clock (TXC)

TXC is sourced by the PHY. It is a continuous clock that provides the timing reference for TXEN and TXD[3:0].

TXC is 2.5MHz for 10Mbps operation and 25MHz for 100Mbps operation.

Transmit Enable (TXEN)

TXEN indicates the MAC is presenting nibbles on TXD[3:0] for transmission. It is asserted synchronously with the first

nibble of the preamble and remains asserted while all nibbles to be transmitted are presented on the MII, and is negated

prior to the first TXC following the final nibble of a frame.

TXEN transitions synchronously with respect to TXC.

Transmit Data [3:0] (TXD[3:0])

TXD[3:0] transitions synchronously with respect to TXC. When TXEN is asserted, TXD[3:0] are accepted for transmission

by the PHY. TXD[3:0] is ”00” to indicate idle when TXEN is de-asserted. Values other than “00” on TXD[3:0] while TXEN

is de-asserted are ignored by the PHY.

Receive Clock (RXC)

RXC provides the timing reference for RXDV, RXD[3:0], and RXER.

•

In 10Mbps mode, RXC is recovered from the line while carrier is active. RXC is derived from the PHY’s reference

clock when the line is idle, or link is down.

•

In 100Mbps mode, RXC is continuously recovered from the line. If link is down, RXC is derived from the PHY’s

reference clock.

RXC is 2.5MHz for 10Mbps operation and 25MHz for 100Mbps operation.

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